Local Electric-Field-Driven Fast Li Diffusion Kinetics at the Piezoelectric LiTaO Modified Li-Rich Cathode-Electrolyte Interphase.

Adv Sci (Weinh) 2020 Feb 17;7(3):1902538. Epub 2019 Dec 17.

School of Physics & Electronics Henan University Kaifeng 475004 P. R. China.

As one of the most promising cathodes for next-generation lithium ion batteries (LIBs), Li-rich materials have been extensively investigated for their high energy densities. However, the practical application of Li-rich cathodes is extremely retarded by the sluggish electrode-electrolyte interface kinetics and structure instability. In this context, piezoelectric LiTaO is employed to functionalize the surface of LiNiMnCoO (LNMCO), aiming to boost the interfacial Li transport process in LIBs. The results demonstrate that the 2 wt% LiTaO-LNMCO electrode exhibits a stable capacity of 209.2 mAh g at 0.1 C after 200 cycles and 172.4 mAh g at 3 C. Further investigation reveals that such superior electrochemical performances of the LiTaO modified electrode results from the additional driving force from the piezoelectric LiTaO layer in promoting Li diffusion at the interface, as well as the stabilized bulk structure of LNMCO. The supplemented LiTaO layer on the LNMCO surface herein, sheds new light on the development of better Li-rich cathodes toward high energy density applications.

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Source
http://dx.doi.org/10.1002/advs.201902538DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7001634PMC
February 2020

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